Install forwarder via Powershell

https://docs.splunk.com/Documentation/Splunk/9.0.4/Installation/InstallonWindowsviathecommandline?_gl=1*1764k9u*_gcl_au*MTI1NDEzNTk2NC4xNzE1OTU0NzQw*FPAU*MTI1NDEzNTk2NC4xNzE1OTU0NzQw*_ga*MTQ5NjA1NjYwMS4xNzE1OTU0NzMy*_ga_5EPM2P39FV*MTcyMjk0Nzk0MS44Ni4xLjE3MjI5NDk4MjQuMC4wLjI3NjY1Njgz#Install_Splunk_Enterprise_from_the_command_linedocs.splunk.com

Install a Windows universal forwarder - Splunk Documentation